Heat pump system for vehicle and method of controlling the same

ABSTRACT

A heat pump system for a vehicle may include a cooling apparatus that supplies and circulates coolant to a motor and an electrical equipment through a cooling line, wherein the cooling apparatus includes a radiator, a cooling fan that ventilates wind to the radiator, and a water pump connected to the cooling line, and an air conditioner apparatus connected through a refrigerant line, wherein the air conditioner apparatus includes a water-cooled condenser connected to the cooling line to change a temperature of the coolant using a waste heat that has occurred in the motor and the electrical equipment according to each mode of the vehicle and that is connected to the refrigerant line to enable an injected refrigerant in the refrigerant line to exchange a heat with the coolant at the inside thereof, and an air-cooled condenser connected in series to the water-cooled condenser through the refrigerant line.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority to Korean Patent Application No.10-2012-0099535 filed on Sep. 7, 2012, the entire contents of which isincorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a heat pump system for a vehicle and amethod of controlling the same that simultaneously use a water heatsource and an air heat source and that improve a heating performance anda dehumidification performance using a waste heat occurring in a motorand an electrical equipment.

2. Description of Related Art

In general, an air-conditioning apparatus for a vehicle includes an airconditioner module for heating and air conditioning indoors of thevehicle.

In such an air conditioner module, a heat exchange medium that isejected by driving of a compressor circulates again to the compressorvia a condenser, a receiver drier, an expansion valve, and anevaporator. In this process, the air conditioner module air-conditionsindoors of the vehicle by heat exchange by the evaporator or heatsindoors of the vehicle by exchanging a heat by injecting hightemperature coolant into a heater.

An environmentally-friendly vehicle is generally classified into anelectric vehicle that drives using a fuel cell or electricity as a powersource and a hybrid vehicle that drives using engine and an electricbattery.

In such environmentally-friendly vehicles, the electric vehicle includesa heat pump system.

In the electric vehicle, in a heating mode, a gas refrigerant of a hightemperature and a high pressure flows to an indoor condenser through avalve and exchanges a heat with inhaled outdoor air, and outdoor air inwhich a heat is exchanged is injected into indoors of the vehicle whilepassing through a positive temperature coefficient (PTC) heater, therebyraising a temperature of vehicle indoors.

However, as described above, as a structure of a compressor, a heatexchanger, and each constituent element becomes complicated, there is aproblem that entire system package becomes complicated.

Further, as surface freezing occurs at an external condenser at a winterseason, heat exchange efficiency, a heating performance, and efficiencyof a heat exchange medium are deteriorated, and when an air conditioningmode is converted to a heating mode, humidity increases by condensationwater remaining at the outside of an evaporator, and thus windowpanes ofthe vehicle are steamed up.

In a defrost mode that removes surface freezing of an external condenserin order to prevent this problem, operation of a compressor is stoppedand heating should be performed with only a PTC heater, and thus while aheating performance is extremely deteriorated, when a heating loadincreases according to increase of a power use amount and the vehicledrives while heating, there is a problem that a travel distance isshortened.

Further, when an outdoor temperature is low, a heating performance isremarkably low and a system is unstable, and when a liquid refrigerantis injected into the compressor, durability of the compressor isdeteriorated.

The information disclosed in this Background of the Invention section isonly for enhancement of understanding of the general background of theinvention and should not be taken as an acknowledgement or any form ofsuggestion that this information forms the prior art already known to aperson skilled in the art.

BRIEF SUMMARY

Various aspects of the present invention are directed to providing aheat pump system for a vehicle and a method of controlling the samehaving advantages of simultaneously using a water heat source and an airheat source, improving a heating performance and a dehumidificationperformance using a waste heat occurring in a motor and an electricalequipment, and preventing external frost of an external condenser in anultra low temperature.

The present invention has been made in an effort to further provide aheat pump system for a vehicle and a method of controlling the samehaving advantages of increasing an entire travel distance of the vehiclewith the same power by reducing a heating load that may occur in aheating mode of the vehicle.

In an aspect of the present invention, a heat pump system for a vehicle,may include a cooling apparatus that supplies and circulates coolant toa motor and an electrical equipment through a cooling line, wherein thecooling apparatus may include a radiator that cools the supplied coolantthrough heat exchange with outdoor air, a cooling fan that ventilateswind to the radiator, and a water pump that is connected to the coolingline and circulates the coolant along the cooling line, and an airconditioner apparatus that is connected through a refrigerant line inorder to adjust heating and air conditioning of vehicle indoors, whereinthe air conditioner apparatus may include a water-cooled condenser thatis connected to the cooling line to change a temperature of the coolantusing a waste heat that may have occurred in the motor and theelectrical equipment according to each mode of the vehicle and that isconnected to the refrigerant line to enable an injected refrigerant inthe refrigerant line to exchange a heat with the coolant at the insidethereof, and an air-cooled condenser that is connected in series to thewater-cooled condenser through the refrigerant line and that enables arefrigerant that is injected into the inside thereof to exchange a heatwith the outdoor air.

The air conditioner apparatus may include a heating, ventilation, andair conditioning (HVAC) module having a switch door that selectivelyadjusts opening at the inside thereof in order to inject outdoor airhaving passed through an evaporator according to a heating mode, an airconditioning mode, and a dehumidification mode into an internalcondenser and a positive temperature coefficient (PTC) heater, acompressor that is connected to the evaporator through the refrigerantline and that compresses a refrigerant of a gas state, an accumulatorthat is provided on the refrigerant line between the compressor and theevaporator and that supplies a gas refrigerant to the compressor, afirst valve that selectively supplies a refrigerant that is exhaustedfrom the compressor to the water-cooled condenser or the internalcondenser according to a mode of the vehicle, a first expansion valvethat receives and expands a refrigerant having passed through theinternal condenser, a second valve that enables a refrigerant that isexpanded through the first expansion valve to sequentially pass throughthe water-cooled condenser and the air-cooled condenser and thatselectively supplies the refrigerant to the evaporator or theaccumulator, and a second expansion valve that is provided between theevaporator and the second valve and that expands a refrigerant that isinjected through switch of the second valve.

A pressure sensor is mounted on a refrigerant line that connects thecompressor and the first valve.

The first and second, and three valves are formed with a 3-way valve.

The cooling apparatus and the air conditioner apparatus are operated bya control signal of a controller.

The cooling apparatus may further include a branch line that isinstalled on the cooling line between the water pump and the radiatorand that bypasses the cooling line in order to directly supply coolantthat is supplied from the water pump to the water-cooled condenseraccording to a heating mode, an air conditioning mode, and adehumidification mode of the vehicle, and a third valve that selectivelyconnects the cooling line and the branch line.

The third valve is formed with a 3-way valve.

The air-cooled condenser may have a plurality of switch films thatselectively inject outdoor air at the front thereof.

The switch film operates by a control signal of a controller, is closedin a heating mode, and is opened in an air conditioning mode and adehumidification mode.

In another aspect of the present invention, a method of controlling aheat pump system for a vehicle having a cooling apparatus that iselectrically connected to a controller and that is fluid-connectedthrough a cooling line and that may include a radiator, a water pump,and an electrical equipment, and an air conditioner apparatus that isconnected through a refrigerant line and that may include a heating,ventilation, and air conditioning (HVAC) module that is formed with aplurality of valves, an expansion valve, a compressor, an accumulator,an evaporator, an internal condenser, a positive temperature coefficient(PTC) heater, and a switch door, may include operating the heat pumpsystem, in a heating mode, an air conditioning mode, and adehumidification mode according to a user's selection, wherein the heatpump system may include a water-cooled condenser that is connected tothe cooling line and the refrigerant line and an air-cooled condenserthat is disposed at the front of the radiator and connected to therefrigerant line, and changing a moving path of a refrigerant thatcirculates the air conditioner apparatus based on the heating mode, theair conditioning mode, and the dehumidification mode according to theuser's selection, through operation of the each valve, such that aswitch door of the HVAC module is selectively open and closed.

In the heating mode, by the cooling apparatus, raising a temperature ofcoolant that is injected into the water-cooled condenser through a wasteheat that may have occurred in the motor and the electrical equipment,enabling the coolant to exchange a heat with a refrigerant that isinjected into the water-cooled condenser through the refrigerant line,injecting the refrigerant having passed through the water-cooledcondenser into the air-cooled condenser, and enabling the refrigerant toexchange a heat with a heat source of outdoor air, and in the heatingmode, by the air conditioner apparatus, enabling a heated refrigerantthrough heat exchange with coolant and outdoor air in the water-cooledcondenser and the air-cooled condenser, supplying the refrigerant to theinternal condenser of the HVAC module through operation of the firstvalve in a state that is compressed with a gas refrigerant of a hightemperature and high pressure state by passing through the accumulatorand the compressor along a refrigerant line through opening of thesecond valve, sequentially supplying and circulating the refrigeranthaving passed through the internal condenser to the water-cooledcondenser and the air-cooled condenser in a state that is expandedthrough the first expansion valve, and opening the switch door so thatoutdoor air, having passed through the evaporator of the HVAC modulefrom the outside passes through the internal condenser, and enabling theinjected outdoor air to heat vehicle indoors together with a selectiveoperation of the PTC heater while passing through the internalcondenser.

In the air conditioning mode, cooling coolant that is injected into theradiator together with outdoor air by a cooling fan, and by the coolingapparatus lowering a temperature of a refrigerant by second heatexchange with outdoor air by injecting a refrigerant that may haveexchanged a heat with coolant while passing through the water-cooledcondenser into the air-cooled condenser while cooling the electricalequipment and the motor by circulating the coolant along the coolingline in a state that is cooled through heat exchange with a refrigerantthat is injected into the water-cooled condenser, and by the airconditioner apparatus supplying an expanded refrigerant to theevaporator by operating the second valve so that a refrigerant of a lowtemperature that is cooled while passing through the air-cooledcondenser injects into the second expansion valve that is connected tothe evaporator of the HVAC module, exhausting the refrigerant that isevaporated through heat exchange with outdoor air in the evaporator,opening a refrigerant line that is connected to the water-cooledcondenser through operation of the first valve and circulates therefrigerant in a state that is compressed while passing through theaccumulator and the compressor, and cooling the vehicle indoors byclosing the switch door so that outdoor air that is cooled while passingthrough the evaporator by a refrigerant that is injected into theevaporator is not injected into the internal condenser and by directlyinjecting outdoor air that is cooled while passing through theevaporator into the vehicle.

In the air conditioning mode, when the vehicle travels, opening eachswitch film that is installed at a front surface of the radiator toinject traveling wind into the radiator.

In the dehumidification mode, as a cooling fan operates, in a state inwhich coolant that is injected into the radiator together with outdoorair is cooled, by the cooling apparatus, cooling the motor and theelectrical equipment through operation of the water pump with cooledcoolant while lowering a temperature of a refrigerant and coolant byheat exchange of the refrigerant and the coolant of a low temperaturethat is injected into the water-cooled condenser, by the air conditionerapparatus, opening the second valve so that a refrigerant of a lowtemperature that is cooled while exchanging a heat with coolant andoutdoor air while sequentially passing through the water-cooledcondenser and the air-cooled condenser is injected into the secondexpansion valve that is connected to the evaporator of the HVAC module,supplying the expanded refrigerant to the evaporator, supplying arefrigerant to the internal condenser by opening a refrigerant line thatis connected to the internal condenser through operation of the firstvalve in a compressed state while passing through the accumulator andthe compressor by exhausting a refrigerant that is evaporated throughheat exchange with outdoor air in the evaporator, supplying andcirculating the refrigerant having passed through the internal condenserto the water-cooled condenser in a state that is expanded through thefirst expansion valve, opening the switch door so that outdoor air thatis cooled while passing through the evaporator of the HVAC module fromthe outside passes through the internal condenser, and, enablinginjected outdoor air to dehumidify vehicle indoors while passing throughthe internal condenser and the PTC heater.

In the dehumidification mode, adjusting, by the controller, an expansionamount of the refrigerant through adjustment of opening of the first andsecond expansion valves.

In the dehumidification mode, when the vehicle travels, opening eachswitch film that is installed at a front surface of the radiator toinject traveling wind into the radiator.

In the heating mode, the air conditioning mode, and the dehumidificationmode, controlling, by the controller, a wind amount of the cooling fanand a flux of the water pump according to a temperature state of a wasteheat that may have occurred in the electrical equipment and atemperature state of the coolant and the refrigerant.

As described above, in a heat pump system for a vehicle and a method ofcontrolling the same according to an exemplary embodiment of the presentinvention, the vehicle heat pump system includes a water-cooledcondenser using coolant as a heat exchange medium and an air-cooledcondenser using an air heat source, makes a refrigerant to flow inseries, and uses a waste heat source occurring in a motor and anelectrical equipment and a heat source of outdoor air, thereby improvingan entire heating performance, efficiency, and a dehumidificationperformance and preventing external frost of the air-cooled condenser inan ultra low temperature.

Further, as a user operates a heating mode by using a waste heat sourcewithout operation of a PTC heater or by using together a waste heatsource and a PTC heater according to a peripheral environment of thevehicle, there is a merit that an entire travel distance of the vehicleincreases with the same power by reducing a heating load while a poweruse amount is prevented from increasing, and an entire market value ofthe heat pump system can be improved.

In an air conditioning mode of the vehicle, in a low speed drivingcondition, in IDLE and low speed driving conditions, which is acondition in which an electric heat amount of a motor and an electricalequipment is small, but that has a large air conditioner electric heatamount, a temperature of coolant that is injected into a water-cooledcondenser is lowered, and by increasing a refrigerant condensationamount through simultaneous application of the water-cooled condenserand the air-cooled condenser, an air conditioning performance can beimproved.

In a dehumidification mode, by reducing a frequent valve switchoperation through application of a 3-way valve, occurrence of noise anda vibration can be reduced due to a valve switch operation, and becausea dehumidification mode can continuously use in intermediate temperatureand much moisture conditions, a remaining amount of condensation waterreduces according to decrease of indoor humidity, and thus a moistureoccurrence condition can be reduced.

Further, by together using outdoor air and coolant as a heat exchangemedium of condensers, while a structure of each constituent element issimplified, a motor and an electrical equipment can be cooled with oneradiator, and entire system package can be reduced and efficiency of aradiator can be improved through reduction of ventilation resistance.

Further, by exchanging a heat of coolant and a refrigerant using a wasteheat that has occurred in a motor and an electrical equipment in awater-cooled condenser, a heat exchange performance can be previouslyprevented from being deteriorated by external freezing that has occurredwhen a conventional air-cooled condenser is individually applied in anultra low temperature condition, and even if a separate defrost modedoes not exist, external frost of an air-cooled condenser can beprevented.

The methods and apparatuses of the present invention have other featuresand advantages which will be apparent from or are set forth in moredetail in the accompanying drawings, which are incorporated herein, andthe following Detailed Description, which together serve to explaincertain principles of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram illustrating a heat pump system for a vehicleaccording to various exemplary embodiments of the present invention.

FIG. 2 is a diagram illustrating a heating mode operation state of aheat pump system for a vehicle according to various exemplaryembodiments of the present invention.

FIG. 3 is a diagram illustrating an air conditioning mode operationstate of a heat pump system for a vehicle according to various exemplaryembodiments of the present invention.

FIG. 4 is a diagram illustrating a dehumidification mode operation stateof a heat pump system for a vehicle according to various exemplaryembodiments of the present invention.

FIG. 5 is a block diagram illustrating a heat pump system for a vehicleaccording to various exemplary embodiments of the present invention.

FIG. 6 is a block diagram illustrating a heat pump system for a vehicleaccording to various exemplary embodiments of the present invention.

It should be understood that the appended drawings are not necessarilyto scale, presenting a somewhat simplified representation of variousfeatures illustrative of the basic principles of the invention. Thespecific design features of the present invention as disclosed herein,including, for example, specific dimensions, orientations, locations,and shapes will be determined in part by the particular intendedapplication and use environment.

In the figures, reference numbers refer to the same or equivalent partsof the present invention throughout the several figures of the drawing.

DETAILED DESCRIPTION

Reference will now be made in detail to various embodiments of thepresent invention(s), examples of which are illustrated in theaccompanying drawings and described below. While the invention(s) willbe described in conjunction with exemplary embodiments, it will beunderstood that the present description is not intended to limit theinvention(s) to those exemplary embodiments. On the contrary, theinvention(s) is/are intended to cover not only the exemplaryembodiments, but also various alternatives, modifications, equivalentsand other embodiments, which may be included within the spirit and scopeof the invention as defined by the appended claims.

An exemplary embodiment of the present invention will hereinafter bedescribed in detail with reference to the accompanying drawings.

Before a description, an exemplary embodiment that is described in thisspecification and a configuration that is shown in the drawings are onlyan exemplary embodiment of the present invention and do not representthe entire spirit and scope of the invention and thus it should beunderstood that various modifications and exemplary variations that canreplace the exemplary embodiment and the configuration may exist at anapplication time point of the present invention.

FIG. 1 is a block diagram illustrating a heat pump system for a vehicleaccording to a first exemplary embodiment of the present invention.

Referring to FIG. 1, in a vehicle heat pump system 100 and a method ofcontrolling the same according to an exemplary embodiment of the presentinvention, the vehicle heat pump system 100 has a structure that cansimultaneously use a water heat source and an air heat source, improve aheating performance and a dehumidification performance using a wasteheat occurring in a motor 111 and an electrical equipment 112, andprevent external frost of an external condenser in an ultra lowtemperature.

Further, the vehicle heat pump system 100 has a structure that canincrease an entire travel distance of the vehicle with the same power byreducing a heating load that may occur in a heating mode of the vehicle.

For this purpose, as shown in FIG. 1, the vehicle heat pump system 100according to an exemplary embodiment of the present invention includes acooling apparatus 110 that supplies coolant to a motor 111, anelectrical equipment 112, and an engine and circulates the coolantthrough a cooling line (hereinafter, referred to as a ‘C.L’) in whichcoolant flows and an air conditioner apparatus 150 that is connectedthrough a refrigerant line (hereinafter, referred to as an ‘R.L’) inwhich a refrigerant flows in order to adjust heating and airconditioning of vehicle indoors.

In the present exemplary embodiment, the cooling apparatus 110 includesa radiator 115 that is provided at the front of the vehicle and thatcirculates coolant along the C.L through operation of a water pump 113and that cools the supplied coolant through a heat exchange with outdoorair and a cooling fan 117 that is mounted at the rear of the radiator115 to ventilate wind to the radiator 115.

The heat pump system 100 according to the present exemplary embodimentfurther includes a water-cooled condenser 130 to which the C.L and theR.L are each connected and an air-cooled condenser 131 that is connectedto the water-cooled condenser 130 through the R.L.

First, the water-cooled condenser 130 is connected to the C.L to changea temperature of coolant using a waste heat occurring in the motor 111and the electrical equipment 112 according to each mode of the vehicle,and the water-cooled condenser 130 is connected to the R.L to enable aninjected refrigerant to exchange a heat with the coolant at the insidethereof.

Here, the water-cooled condenser 130 has a temperature sensor at theinside thereof, and the temperature sensor senses a water temperature ofinjected coolant and a temperature of a refrigerant.

In the present exemplary embodiment, the water-cooled condenser 130 isseparately provided from the radiator 115 to be connected through the C.L, but the present invention is not limited thereto and the water-cooledcondenser 130 may be integrally formed at the inside of the radiator115.

In the present exemplary embodiment, the air-cooled condenser 131 iscoupled in series to the water-cooled condenser 130 through the R.L andis disposed at the front of the radiator 115 to enable a refrigerantthat is injected into the inside to exchange a heat with outdoor air.

In the present exemplary embodiment, the air conditioner apparatus 150includes a heating, ventilation, and air conditioning (HVAC) module 151,a compressor 161, an accumulator 163, first and second valves 165 and167, and first and second expansion valves 169 and 171, and hereinafter,each constituent element will be described in detail.

First, in order to inject outdoor air, having passed through anevaporator 157 into an internal condenser 153 and a PTC heater 155according to air conditioning, heating, and dehumidification modes, theHVAC module 151 has a switch door 159 that selectively adjusts openingat the inside thereof.

That is, the switch door 159 is opened to inject outdoor air, havingpassed through the evaporator 157 into the internal condenser 153 andthe PTC heater 155 upon heating the vehicle and closes the internalcondenser 153 and the PTC heater 155 in order to directly inject outdoorair that is cooled while passing through the evaporator 157 into thevehicle upon air conditioning.

In the present exemplary embodiment, the compressor 161 is connected tothe evaporator 157 through the R.L and compresses a refrigerant of a gasstate.

The accumulator 163 is provided on the R.L between the compressor 161and the evaporator 157, stores a liquid refrigerant at the insidethereof in order to supply only a gas refrigerant to the compressor 161,vaporizes the stored liquid refrigerant, and supplies again a gasrefrigerant to the compressor 161, thereby improving efficiency anddurability of the compressor 161.

In the present exemplary embodiment, the first valve 165 selectivelysupplies a refrigerant that is exhausted from the compressor 161 to theinternal condenser 153 according to a mode of the vehicle, and the firstexpansion valve 169 receives and expands a refrigerant, having passedthrough the internal condenser 153.

In the present exemplary embodiment, the first valve 165 selectivelysupplies a refrigerant that is exhausted from the compressor 161 to thewater-cooled condenser 130 or the internal condenser 153 according to amode of the vehicle.

The first expansion valve 169 receives and expands the refrigerant,having passed through the internal condenser 153 through the R.L.

Here, a pressure sensor 175 is mounted on the R.L between the compressor161 and the first valve 165 and senses a pressure of a refrigerant thatis exhausted in a state that is compressed by the compressor 161.

The second valve 167 enables a refrigerant that is expanded through thesecond expansion valve 171 to sequentially pass through the water-cooledcondenser 130 and the air-cooled condenser 131 and selectively suppliesthe refrigerant to the evaporator 157 or the accumulator 163.

The second expansion valve 171 is provided between the evaporator 157and the second valve 167, expands a refrigerant that is injected throughswitch of the second valve 167, and supplies the refrigerant to theevaporator 157.

Here, the first valve 165 supplies a refrigerant to the water-cooledcondenser 130 or the internal condenser 153, and the second valve 167 ispreferably formed with a 3-way valve that selectively switches andconnects the R.L in order to supply the refrigerant to the accumulator163 or the second expansion valve 171.

The cooling apparatus 110 and the air conditioner apparatus 150 havingthe above-described configuration are each connected to a controller 180and operate by a control signal of the controller 180.

That is, the controller 180 controls the cooling fan 117 of the coolingapparatus 110 and the water pump 113 according to a heating mode, an airconditioning mode, and a dehumidification mode of the vehicle by auser's selection and a signal that is output from a temperature sensorof the condenser 130.

Further, while controlling a switch operation of the switch door 159 ofthe HVAC module 151 in the air conditioner apparatus 150 according to amode of the vehicle, the controller 180 controls a switch operation ofthe first and second valves 165 and 167 and controls an expansion amountof a refrigerant by controlling the first and second expansion valves169 and 171.

Hereinafter, operation of a vehicle heater pump system and a method ofcontrolling the vehicle heater pump system having the above-describedconfiguration according to an exemplary embodiment of the presentinvention will be described in detail with reference to FIGS. 2 to 4.

FIGS. 2 to 4 are diagrams illustrating an operation state in a heatingmode, an air conditioning mode, and a dehumidification mode of a heatpump system for a vehicle according to a first exemplary embodiment ofthe present invention.

First, a method of controlling a heat pump system for a vehicleaccording to a first exemplary embodiment of the present invention isapplied to the heat pump system 100 including the cooling apparatus 110that is connected to the controller 180 and that is connected throughthe C.L and that includes the radiator 115, the water pump 113, themotor 111, and the electrical equipment 112 and the air conditionerapparatus 150 that is connected through the R.L and that includes theHVAC module 151 that is formed with the plurality of valves 165 and 167,the expansion valves 169 and 171, the compressor 161, the accumulator163, the evaporator 157, the internal condenser 153, the PTC heater 155,and the switch door 159.

Here, as described above, the heat pump system 100 further includes thewater-cooled condenser 130 that is connected to the C.L and the R.L andthe air-cooled condenser 131 that is disposed at the front of theradiator 115 and that is coupled in series to the water-cooled condenser130 through the R.L.

In the method of controlling the heat pump system 100, a moving path ofa refrigerant that circulates the air conditioner apparatus 150 on amode basis according to a user's selection is changed through operationof the valves 165 and 167, and the switch door 159 of the HVAC module151 is selectively opened and closed.

That is, a heating mode, an air conditioning mode, and adehumidification mode of the heat pump system 100 according to anexemplary embodiment of the present invention may be operated accordingto a user's selection or automatic adjustment.

First, in a heating mode of the heat pump system 100, operation of theheat pump system 100 and a method of controlling the heat pump system100 will be described with reference to FIG. 2.

Referring to FIG. 2, in a heating mode, the cooling apparatus 110 raisesa temperature of coolant that is injected into the water-cooledcondenser 130 using a waste heat occurring in the motor 111 and theelectrical equipment 112 and enables the coolant to exchange a heat witha refrigerant that is injected into the water-cooled condenser 130through the R.L.

The refrigerant, having passed through the water-cooled condenser 130 isinjected into the air-cooled condenser 131 and is condensed through heatexchange with outdoor air while passing through the air-cooled condenser131.

In this case, as operation of the cooling fan 117 is stopped or as awind velocity of the cooling fan 117 is deteriorated, cooling of coolantthat is injected into the radiator 115 is delayed or prevented.

In such a state, the water-cooled condenser 130 raises a temperature ofa refrigerant through heat exchange with the refrigerant that isinjected through the R.L.

Here, the controller 180 determines a temperature of coolant and arefrigerant through a temperature sensor that is mounted in thewater-cooled condenser 130, and controls a flux of the water pump 113 ora wind amount of the cooling fan 117 according to a temperature state ofa waste heat that has occurred in the motor 111 and the electricalequipment 112, a temperature state of coolant, and a pressure state of arefrigerant.

The air conditioner apparatus 150 enables a refrigerant that is heatedthrough heat exchange with coolant and outdoor air in the water-cooledcondenser 130 and the air-cooled condenser 131, respectively to passthrough the accumulator 163 and the compressor 161 along the R.L throughopening of the second valve 167.

Accordingly, in a state that is compressed in a gas refrigerant of ahigh temperature and high pressure state while passing through thecompressor 161, as the R.L that is connected to the internal condenser153 is opened by the first valve 165, the refrigerant is supplied to theinternal condenser 153.

Here, the pressure sensor 175 that is mounted on the R.L between thecompressor 161 and the first valve 165 measures a pressure of arefrigerant that is exhausted from the compressor 161 and outputs ameasured value thereof to the controller 180.

The controller 180 determines a pressure of a refrigerant according tothe measured value that is output from the pressure sensor 175 andadjusts opening of the first valve 165 according to a requested vehiclestate.

The refrigerant, having passed through the internal condenser 153 movesalong the R.L in a state that is expanded through the first expansionvalve 169, sequentially passes through the water-cooled condenser 130and the air-cooled condenser 131, and circulates along the R.L throughrepetition of the above-described operation.

That is, in a heating mode, when a gas refrigerant of a high temperatureand high pressure state is supplied to the internal condenser 153, thecontroller 180 opens the switch door 159 so that outdoor air, havingpassed through the evaporator 157 of the HVAC module 151 from theoutside passes through the internal condenser 153.

Accordingly, when outdoor air that is injected from the outside passesthrough the evaporator 157 in which a refrigerant is not supplied, theoutdoor air is injected in a room temperature state that is not cooled,is converted to a high temperature state while passing through theinternal condenser 153, and is supplied into vehicle indoors togetherwith a selective operation of the PTC heater 155, thereby heatingvehicle indoors.

In the present exemplary embodiment, in an air conditioning mode of theheat pump system 100, operation of the heat pump system 100 and a methodof controlling the heat pump system 100 will be described with referenceto FIG. 3.

First, in an air conditioning mode, as shown in FIG. 3, as the coolingfan 117 operates by the controller 180, the cooling apparatus 110 coolscoolant that is injected into the radiator 115 together with outdoorair.

In this case, the cooling fan 117 operates in a maximum speed to coolcoolant, having passed through the radiator 115 to the maximum.

In such a state, the cooled coolant circulates along the C.L throughoperation of the water pump 113 and cools the motor 111 and theelectrical equipment 112 in a state that is cooled through heat exchangewith a refrigerant while passing through the water-cooled condenser 130.

In a state in which the refrigerant exchanges a heat with coolant whilepassing through the water-cooled condenser 130, the refrigerant isinjected into the air-cooled condenser 131 to secondly exchange a heatwith outdoor air and thus a temperature of the refrigerant is lowered,and the refrigerant is efficiently condensed.

Here, the controller 180 determines a temperature of coolant through atemperature sensor that is mounted in the water-cooled condenser 130 andcontrols a flux of the water pump 113 or a wind amount of the coolingfan 117 according to a temperature state of a waste heat occurring inthe motor 111 and the electrical equipment 112 and a temperature stateof coolant.

The controller 180 opens the R.L by operating the second valve 167 sothat a refrigerant of a low temperature that is cooled while passingthrough the air-cooled condenser 131 in the air conditioner apparatus150 is injected into the second expansion valve 171 that is connected tothe evaporator 157 of the HVAC module 151.

The refrigerant of a low temperature that is injected into the secondexpansion valve 171 is supplied to the evaporator 157 along the R.L inan expanded state.

Thereafter, the refrigerant is evaporated through heat exchange withoutdoor air in the evaporator 157 and is compressed while passingthrough the accumulator 163 and the compressor 161 along the R.L.

While the refrigerant, having compressed through the above-describedoperation repeats the above-described operation through opening of theR.L that is connected again to the water-cooled condenser 130 throughoperation of the first valve 165, the refrigerant circulates along theR.L.

Here, outdoor air that is injected into the HVAC module 151 is cooledwhile passing through the evaporator 157 by the refrigerant of a lowtemperature state that is injected into the evaporator 157.

In this case, the switch door 159 closes a passing portion toward theinternal condenser 153 so that the cooled outdoor air does not passthrough the internal condenser 153 and the PTC heater 155 and directlyinjects the cooled outdoor air into the vehicle, thereby performing airconditioning.

In a dehumidification mode of the heat pump system 100, operation of theheat pump system 100 and a method of controlling the heat pump system100 will be described with reference to FIG. 4.

First, in the dehumidification mode, as shown in FIG. 4, as the coolingfan 117 operates by the controller 180, the cooling apparatus 110 coolscoolant that is injected into the radiator 115 together with outdoorair.

In such a state, the cooled coolant is injected into the water-cooledcondenser 130 through operation of the water pump 113, and is circulatedalong the C.L in a state having a lowered temperature through heatexchange with a refrigerant, thereby cooling the motor 111 and theelectrical equipment 112.

Here, the controller 180 determines a temperature of coolant and arefrigerant through a temperature sensor that is mounted in thewater-cooled condenser 130 and controls a flux the water pump 113 or awind amount of the cooling fan 117 according to a temperature state of awaste heat that has occurred in the motor 111 and the electricalequipment 112, a temperature state of coolant, and a pressure state ofthe refrigerant.

In order to inject a refrigerant of a low temperature that is cooledthrough heat exchange with coolant of a low temperature state andoutdoor air into the second expansion valve 171 that is connected to theevaporator 157 of the HVAC module 151 while sequentially passing throughthe water-cooled condenser 130 and the air-cooled condenser 131, the airconditioner apparatus 150 opens the R.L through operation of the secondvalve 167.

Thereafter, the refrigerant of a low temperature that is injected intothe second expansion valve 171 is supplied to the evaporator 157 alongthe R.L in an expanded state.

Thereafter, the refrigerant is evaporated through heat exchange withoutdoor air in the evaporator 157 and is compressed to a gas refrigerantof a high temperature high pressure state while passing through theaccumulator 163 and the compressor 161 along the R.L.

As the R.L that is connected to the internal condenser 153 is opened bythe first valve 165, the compressed gas refrigerant is supplied to theinternal condenser 153.

Here, the pressure sensor 175 that is mounted on the R.L between thecompressor 161 and the first valve 165 measures a pressure of arefrigerant that is exhausted from the compressor 161 and outputs ameasured value thereof to the controller 180.

The controller 180 determines a pressure of the refrigerant according tothe measured value that is output from the pressure sensor 175 andadjusts opening of the first valve 165 according to a requested vehiclestate.

The refrigerant, having passed through the internal condenser 153 passesthrough the water-cooled condenser 130 along the R.L that is connectedto the water-cooled condenser 130 and is injected into the air-cooledcondenser 131 in a state that is expanded through the first expansionvalve 169, and circulates along the R.L while repeating theabove-described operation.

In this case, the controller 180 adjusts an expansion amount of arefrigerant through adjustment of opening of the first and secondexpansion valves 169 and 171.

Here, outdoor air that is injected into the HVAC module 151 is cooledwhile passing through the evaporator 157 by the refrigerant of a lowtemperature state that is injected into the evaporator 157.

In this case, the switch door 159 opens a portion that is connected tothe internal condenser 153 so that the cooled outdoor air passes throughthe internal condenser 153, and the injected outdoor air is dehumidifiedwhile passing through the evaporator 157, is heated through the internalcondenser 153, and is injected into the vehicle, thereby dehumidifyingindoors of the vehicle.

When describing a method of controlling a heat pump system for a vehicleaccording to an exemplary embodiment of the present invention, in theheating mode, the PTC heater 155 operates together with outdoor air, butthe present invention is not limited thereto and operation of the PTCheater 155 is selected and embodied by setting of a heating temperatureaccording to a user's selection.

Accordingly, a heating mode may includes a quick heating mode thatoperates together with the PTC heater 155 or a general heating mode thatperforms heating with only outdoor air, having passed through theinternal condenser 153 without operation of the PTC heater 155.

Therefore, as described above, when the vehicle heat pump system 100 anda method of controlling the same according to an exemplary embodiment ofthe present invention is applied, the vehicle heat pump system 100includes the water-cooled condenser 130 using coolant as a heat exchangemedium and the air-cooled condenser 131 using an air heat source, makesa refrigerant to flow in series and uses a waste heat source occurringin the motor 111 and the electrical equipment 112 and a heat source ofoutdoor air, thereby improving an entire heating performance,efficiency, and a dehumidification performance and preventing externalfrost of the air-cooled condenser 131 that is disposed at the outside inan ultra low temperature.

Further, as a user operates a heating mode by using a waste heat withoutoperation of the PTC heater 155 or by using together a waste heat andthe PTC heater 155 according to a peripheral environment of the vehicle,a power use amount is prevented from increasing, and by simultaneouslyreducing a heating load, there is a merit that an entire travel distanceof the vehicle increases with the same power and an entire market valueof the heat pump system can be improved.

In an air conditioning mode of the vehicle, in a low driving condition,an electric heat amount of the motor 111 and the electrical equipment112 is small, but in IDLE and low speed driving conditions, which is acondition having a large air conditioner electric heat amount, atemperature of coolant that is injected into the water-cooled condenseris lowered, and by increasing a refrigerant condensation amount throughsimultaneous application of the water-cooled condenser 130 and theair-cooled condenser 131, an air conditioning performance can beimproved.

In a dehumidification mode, by reducing a frequent valve switchoperation through application of a 3-way valve, occurrence of noise anda vibration due to a valve switch operation can be reduced, and inintermediate temperature and much moisture conditions, because adehumidification mode can be continuously used, the remaining amount ofcondensation water according to decrease of indoor humidity is reducedand thus a condition in which moisture occurs can be reduced.

Further, by using together outdoor air and coolant as a heat exchangemedium of the condensers 130 and 131, while a structure of eachconstituent element is simplified, the motor 111 and the electricalequipment 112 can be cooled with one radiator 115, and entire systempackage can be reduced and efficiency of the radiator can be improvedthrough reduction of ventilation resistance.

Further, in the water-cooled condenser 130, by performing heat exchangeof coolant and a refrigerant using a waste heat that has occurred in themotor 111 and the electrical equipment 112, a heat exchange performancecan be previously prevented from being deteriorated according toexternal frost that has occurred when individually applying aconventional air-cooled condenser in an ultra low temperature condition,and external frost of the air-cooled condenser 131 can be preventedwithout a separate defrost mode.

When describing a heat pump system for a vehicle and a method ofcontrolling the same according to an exemplary embodiment of the presentinvention, the vehicle heat pump system includes the first and secondvalves 165 and 167, but the present invention is not limited thereto andby applying a separate 2-way valve on a cooling line and a refrigerantline, a working fluid may be bypassed or a flux of a working fluid maybe adjusted.

FIG. 5 is a block diagram illustrating a heat pump system for a vehicleaccording to a second exemplary embodiment of the present invention.

Referring to FIG. 5, a vehicle heat pump system 200 according to asecond exemplary embodiment of the present invention includes a coolingapparatus 210 that supplies and circulates coolant to a motor 211, anelectrical equipment 212, and a non-illustrated engine through a C.L inwhich coolant flows and an air conditioner apparatus 250 that isconnected through an R.L in which coolant flows to adjust heating andair conditioning of vehicle indoors.

In the present exemplary embodiment, the cooling apparatus 210 includesa radiator 215 that is provided at the front of the vehicle to circulatecoolant along the C.L through operation of a water pump 213 and thatcools the supplied coolant through heat exchange with outdoor air and acooling fan 217 that is mounted at the rear of the radiator 215 toventilate wind to the radiator 215.

The heat pump system 200 according to a second exemplary embodiment ofthe present invention further includes a water-cooled condenser 230 towhich the C.L and the R.L are each connected and an air-cooled condenser231 that is connected to the water-cooled condenser 230 through the R.L.

First, the water-cooled condenser 230 is connected to the C.L to changea temperature of coolant using a waste heat occurring in the motor 211and the electrical equipment 212 according each mode of the vehicle, andthe water-cooled condenser 230 is connected to the R.L to enable aninjected refrigerant to exchange a heat with coolant at the insidethereof.

Here, the water-cooled condenser 230 has a temperature sensor at theinside thereof, and the temperature sensor senses a water temperature ofinjected coolant and a temperature of a refrigerant.

In a second exemplary embodiment of the present invention, theair-cooled condenser 231 is coupled in series to the water-cooledcondenser 230 through the R.L, and the air-cooled condenser 231 isdisposed at the front of the radiator 215 to enable a refrigerant thatis injected into the inside thereof coolant to exchange a heat withoutdoor air.

Here, the cooling apparatus 210 according to a second exemplaryembodiment of the present invention further includes a branch line 223and a third valve 221.

First, the branch line 223 is installed on the C.L between the waterpump 213 and the radiator 215 and bypasses the C.L in order to directlysupply coolant that is supplied from the water pump 213 to thewater-cooled condenser 130 according to a heating mode, an airconditioning mode, and a dehumidification mode of the vehicle.

The third valve 221 selectively connects the C.L and the branch line223.

The third valve 221 is controlled by a controller 280, bypasses coolantthrough the branch line 223 without passing through the radiator 215through a switch operation in a heating mode of the vehicle, directlysupplies the coolant to the water-cooled condenser 230, and enables thecoolant to pass through the motor 211 and the electrical equipment 212,thereby performing a function of raising a water temperature of thecoolant by a waste heat.

In order to supply coolant to the radiator 215 or the water-cooledcondenser 230, the third valve 221 is preferably a 3-way valve thatselectively switches and connects the C.L and the branch line 223.

In a second exemplary embodiment of the present invention, the airconditioner apparatus 250 includes a heating, ventilation, and airconditioning (HVAC) module 251, a compressor 261, an accumulator 263,first and second valves 265 and 267, and first and second expansionvalves 269 and 271.

The HVAC module 251 has a switch door 259 that selectively adjustsopening at the inside thereof in order to inject outdoor air, havingpassed through an evaporator 257 into an internal condenser 253 and aPTC heater 255 according to air conditioning, heating, anddehumidification modes.

The cooling apparatus 210 and the air conditioner apparatus 250 areconnected to the controller 280 and each operate according to a controlsignal of the controller 280.

The air conditioner apparatus 250 having such a configuration is thesame as that in the first exemplary embodiment of the present inventionand therefore a detailed description thereof will be omitted.

Further, in a method of controlling a heat pump system according to asecond exemplary embodiment of the present invention, in a heating mode,by circulating coolant to the motor 211, the electrical equipment 212,and the water-cooled condenser 230 along the C.L instead of injectingcoolant into the radiator 215 through switch of the third valve 221, atemperature of coolant is more quickly rises through a heat exchangewith a waste heat.

In a method of controlling a heat pump system according to a secondexemplary embodiment of the present invention, in a heating mode inwhich the third valve 221 operates, only a coolant circulation path ofthe cooling apparatus 210 is changed and the method according to thesecond exemplary embodiment is the same as that of the first exemplaryembodiment in operation and control of each constituent in an airconditioning mode and a dehumidification mode and thus a detaileddescription thereof will be omitted.

FIG. 6 is a block diagram illustrating a heat pump system for a vehicleaccording to a third exemplary embodiment of the present invention.

Referring to FIG. 6, a vehicle heat pump system 300 according to a thirdexemplary embodiment of the present invention includes a coolingapparatus 310 that supplies and circulates coolant to a motor 311, anelectrical equipment 312 and a non-illustrated engine through a C.L inwhich coolant flows and an air conditioner apparatus 350 that isconnected through an R.L in which a refrigerant flows to adjust heatingand air conditioning of vehicle indoors.

In the present exemplary embodiment, the cooling apparatus 310 includesa radiator 315 that is provided at the front of the vehicle to circulatecoolant along the C.L through operation of the water pump 313 and thatcools the supplied coolant through heat exchange with outdoor air, and acooling fan 317 that is mounted at the rear side of the radiator 315 toventilate wind to the radiator 315.

The heat pump system 300 according to a second exemplary embodiment ofthe present invention further includes a water-cooled condenser 330 inwhich the C.L and the R.L are each connected and an air-cooled condenser331 that is connected to the water-cooled condenser 330 through the R.L.

First, the water-cooled condenser 330 is connected to the C.L to changea temperature of coolant using a waste heat that has occurred in themotor 311 and the electrical equipment 312 according to each mode of thevehicle, and the water-cooled condenser 330 is connected to the R.L toenable an injected refrigerant to exchange a heat with coolant at theinside thereof.

Here, the water-cooled condenser 330 has a temperature sensor at theinside thereof, and the temperature sensor senses a water temperature ofthe injected coolant and a temperature of a refrigerant.

In a second exemplary embodiment of the present invention, theair-cooled condenser 331 is coupled in series to the water-cooledcondenser 330 through the R.L and is disposed at the front of theradiator 315 to enable a refrigerant that is injected into the insidethereof to exchange a heat with outdoor air.

Here, the air-cooled condenser 331 has a plurality of switch films 321that selectively inject traveling wind or outdoor air from the outsideof the vehicle at the front thereof.

The each switch film 321 adjusts injection of outdoor air by opening orclosing a front surface of the air-cooled condenser 331 according to aheating mode, an air conditioning mode, and a dehumidification mode ofthe vehicle according to a driver's selection, thereby adjusting acooling performance of the air-cooled condenser 331.

That is, the switch film 321 operates by a control signal of acontroller 380, is closed in a heating mode, and is opened in an airconditioning mode and a dehumidification mode.

In a third exemplary embodiment of the present invention, the airconditioner apparatus 350 includes a heating, ventilation, and airconditioning (HVAC) module 351, a compressor 361, an accumulator 363,first and second valves 365 and 367, and first and second expansionvalves 369 and 371.

The HVAC module 351 has a switch door 359 that selectively adjustsopening to inject outdoor air, having passed through an evaporator 357into an internal condenser 353 and a PTC heater 355 at the insidethereof according to air conditioning, heating, and dehumidificationmodes.

The cooling apparatus 310 and the air conditioner apparatus 350 areconnected to the controller 380 and each operate according to a controlsignal of the controller 380.

The air conditioner apparatus 350 having such a configuration is thesame as that in the first exemplary embodiment of the present inventionand therefore a detailed description thereof will be omitted.

Further, in a method of controlling a heat pump system according to athird exemplary embodiment of the present invention, in a heating mode,the switch film 321 that is mounted at the front of the air-cooledcondenser 331 is closed by a control signal of the controller 380 toprevent traveling wind from being injected into the radiator 315 and theair-cooled condenser 331.

Simultaneously, as the controller 380 stops operation of the cooling fan317 or deteriorates a wind velocity thereof, cooling of coolant, havingpassed through the radiator 315 is prevented, and a refrigerant, havingpassed through the air-cooled condenser 331 exchanges a heat withoutdoor air within an engine compartment, thereby using an air heatsource.

Alternatively, in an air conditioning mode and a dehumidification mode,in order to inject traveling wind and outdoor air into the radiator 315and the air-cooled condenser 331, the each switch film 321 is opened bya control signal of the controller 380, thereby increasing coolingefficiency of the radiator 315 and the air-cooled condenser 331.

Here, in a dehumidification mode, the switch film 321 may maintain orclose an opened state according to an air conditioner pressure.

In a method of controlling a heat pump system according to a thirdexemplary embodiment of the present invention, only an open or closeoperation of the switch film 321 that is installed at the front of theair-cooled condenser 331 is different, and the method of the thirdexemplary embodiment is the same as operation and control of constituentelements in a heating mode, an air conditioning mode, and adehumidification mode according to the first exemplary embodiment andthus a detailed description thereof will be omitted.

In the first, second, and third exemplary embodiments of the presentinvention, in the heat pump systems 100, 200, and 300, the motors 111,211, and 311 and the electrical equipments 112, 212, and 312 aredisposed in series to the water-cooled condenser 130, 230, and 330 inthe cooling apparatus 110, 210, and 310, but the present invention isnot limited thereto, the water-cooled condenser 130, 230, and 330 may bedisposed in parallel to the motor 111, 211, and 311 and the electricalequipments 112, 212, and 312.

For convenience in explanation and accurate definition in the appendedclaims, the terms “upper”, “lower”, “inner” and “outer” are used todescribe features of the exemplary embodiments with reference to thepositions of such features as displayed in the figures.

The foregoing descriptions of specific exemplary embodiments of thepresent invention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit theinvention to the precise forms disclosed, and obviously manymodifications and variations are possible in light of the aboveteachings. The exemplary embodiments were chosen and described in orderto explain certain principles of the invention and their practicalapplication, to thereby enable others skilled in the art to make andutilize various exemplary embodiments of the present invention, as wellas various alternatives and modifications thereof. It is intended thatthe scope of the invention be defined by the Claims appended hereto andtheir equivalents.

What is claimed is:
 1. A heat pump system for a vehicle, comprising: acooling apparatus that supplies and circulates coolant to a motor and anelectrical equipment through a cooling line, wherein the coolingapparatus includes: a radiator that cools the supplied coolant throughheat exchange with outdoor air; a cooling fan that ventilates wind tothe radiator; and a water pump that is connected to the cooling line andcirculates the coolant along the cooling line; and an air conditionerapparatus that is connected through a refrigerant line in order toadjust heating and air conditioning of vehicle indoors, wherein the airconditioner apparatus includes: a water-cooled condenser that isconnected to the cooling line to change a temperature of the coolantusing a waste heat that has occurred in the motor and the electricalequipment according to each mode of the vehicle and that is connected tothe refrigerant line to enable an injected refrigerant in therefrigerant line to exchange a heat with the coolant at the insidethereof; and an air-cooled condenser that is connected in series to thewater-cooled condenser through the refrigerant line and that enables arefrigerant that is injected into the inside thereof to exchange a heatwith the outdoor air.
 2. The heat pump system of claim 1, wherein theair conditioner apparatus includes a heating, ventilation, and airconditioning (HVAC) module having a switch door that selectively adjustsopening at the inside thereof in order to inject outdoor air havingpassed through an evaporator according to a heating mode, an airconditioning mode, and a dehumidification mode into an internalcondenser and a positive temperature coefficient (PTC) heater; acompressor that is connected to the evaporator through the refrigerantline and that compresses a refrigerant of a gas state; an accumulatorthat is provided on the refrigerant line between the compressor and theevaporator and that supplies a gas refrigerant to the compressor; afirst valve that selectively supplies a refrigerant that is exhaustedfrom the compressor to the water-cooled condenser or the internalcondenser according to a mode of the vehicle; a first expansion valvethat receives and expands a refrigerant having passed through theinternal condenser; a second valve that enables a refrigerant that isexpanded through the first expansion valve to sequentially pass throughthe water-cooled condenser and the air-cooled condenser and thatselectively supplies the refrigerant to the evaporator or theaccumulator; and a second expansion valve that is provided between theevaporator and the second valve and that expands a refrigerant that isinjected through switch of the second valve.
 3. The heat pump system ofclaim 2, wherein a pressure sensor is mounted on a refrigerant line thatconnects the compressor and the first valve.
 4. The heat pump system ofclaim 2, wherein the first and second, and third valves are formed witha 3-way valve.
 5. The heat pump system of claim 1, wherein the coolingapparatus and the air conditioner apparatus are operated by a controlsignal of a controller.
 6. The heat pump system of claim 1, wherein thecooling apparatus further includes a branch line that is installed onthe cooling line between the water pump and the radiator and thatbypasses the cooling line in order to directly supply coolant that issupplied from the water pump to the water-cooled condenser according toa heating mode, an air conditioning mode, and a dehumidification mode ofthe vehicle; and a third valve that selectively connects the coolingline and the branch line.
 7. The heat pump system of claim 6, whereinthe third valve is formed with a 3-way valve.
 8. The heat pump system ofclaim 1, wherein the air-cooled condenser has a plurality of switchfilms that selectively inject outdoor air at the front thereof.
 9. Theheat pump system of claim 8, wherein the switch film operates by acontrol signal of a controller, is closed in a heating mode, and isopened in an air conditioning mode and a dehumidification mode.
 10. Amethod of controlling a heat pump system for a vehicle having a coolingapparatus that is electrically connected to a controller and that isfluid-connected through a cooling line and that includes a radiator, awater pump, and an electrical equipment, and an air conditionerapparatus that is connected through a refrigerant line and that includesa heating, ventilation, and air conditioning (HVAC) module that isformed with a plurality of valves, an expansion valve, a compressor, anaccumulator, an evaporator, an internal condenser, a positivetemperature coefficient (PTC) heater, and a switch door, the methodcomprising: operating the heat pump system, in a heating mode, an airconditioning mode, and a dehumidification mode according to a user'sselection, wherein the heat pump system includes a water-cooledcondenser that is connected to the cooling line and the refrigerant lineand an air-cooled condenser that is disposed at the front of theradiator and connected to the refrigerant line, and changing a movingpath of a refrigerant that circulates the air conditioner apparatusbased on the heating mode, the air conditioning mode, and thedehumidification mode according to the user's selection, throughoperation of the each valve, such that a switch door of the HVAC moduleis selectively open and closed.
 11. The method of claim 10, wherein: inthe heating mode, by the cooling apparatus, raising a temperature ofcoolant that is injected into the water-cooled condenser through a wasteheat that has occurred in the motor and the electrical equipment;enabling the coolant to exchange a heat with a refrigerant that isinjected into the water-cooled condenser through the refrigerant line;injecting the refrigerant having passed through the water-cooledcondenser into the air-cooled condenser; and enabling the refrigerant toexchange a heat with a heat source of outdoor air; and in the heatingmode, by the air conditioner apparatus, enabling a heated refrigerantthrough heat exchange with coolant and outdoor air in the water-cooledcondenser and the air-cooled condenser; supplying the refrigerant to theinternal condenser of the HVAC module through operation of the firstvalve in a state that is compressed with a gas refrigerant of a hightemperature and high pressure state by passing through the accumulatorand the compressor along a refrigerant line through opening of thesecond valve; sequentially supplying and circulating the refrigeranthaving passed through the internal condenser to the water-cooledcondenser and the air-cooled condenser in a state that is expandedthrough the first expansion valve; and opening the switch door so thatoutdoor air, having passed through the evaporator of the HVAC modulefrom the outside passes through the internal condenser; and enabling theinjected outdoor air to heat vehicle indoors together with a selectiveoperation of the PTC heater while passing through the internalcondenser.
 12. The method of claim 10, wherein in the air conditioningmode, cooling coolant that is injected into the radiator together withoutdoor air by a cooling fan; and by the cooling apparatus: lowering atemperature of a refrigerant by second heat exchange with outdoor air byinjecting a refrigerant that has exchanged a heat with coolant whilepassing through the water-cooled condenser into the air-cooled condenserwhile cooling the electrical equipment and the motor by circulating thecoolant along the cooling line in a state that is cooled through heatexchange with a refrigerant that is injected into the water-cooledcondenser, and by the air conditioner apparatus: supplying an expandedrefrigerant to the evaporator by operating the second valve so that arefrigerant of a low temperature that is cooled while passing throughthe air-cooled condenser injects into the second expansion valve that isconnected to the evaporator of the HVAC module; exhausting therefrigerant that is evaporated through heat exchange with outdoor air inthe evaporator; opening a refrigerant line that is connected to thewater-cooled condenser through operation of the first valve andcirculates the refrigerant in a state that is compressed while passingthrough the accumulator and the compressor; and cooling the vehicleindoors by closing the switch door so that outdoor air that is cooledwhile passing through the evaporator by a refrigerant that is injectedinto the evaporator is not injected into the internal condenser and bydirectly injecting outdoor air that is cooled while passing through theevaporator into the vehicle.
 13. The method of claim 12, wherein in theair conditioning mode, when the vehicle travels, opening each switchfilm that is installed at a front surface of the radiator to injecttraveling wind into the radiator.
 14. The method of claim 10, wherein inthe dehumidification mode, as a cooling fan operates, in a state inwhich coolant that is injected into the radiator together with outdoorair is cooled, by the cooling apparatus, cooling the motor and theelectrical equipment through operation of the water pump with cooledcoolant while lowering a temperature of a refrigerant and coolant byheat exchange of the refrigerant and the coolant of a low temperaturethat is injected into the water-cooled condenser; by the air conditionerapparatus, opening the second valve so that a refrigerant of a lowtemperature that is cooled while exchanging a heat with coolant andoutdoor air while sequentially passing through the water-cooledcondenser and the air-cooled condenser is injected into the secondexpansion valve that is connected to the evaporator of the HVAC module;supplying the expanded refrigerant to the evaporator; supplying arefrigerant to the internal condenser by opening a refrigerant line thatis connected to the internal condenser through operation of the firstvalve in a compressed state while passing through the accumulator andthe compressor by exhausting a refrigerant that is evaporated throughheat exchange with outdoor air in the evaporator; supplying andcirculating the refrigerant having passed through the internal condenserto the water-cooled condenser in a state that is expanded through thefirst expansion valve; opening the switch door so that outdoor air thatis cooled while passing through the evaporator of the HVAC module fromthe outside passes through the internal condenser; and enabling injectedoutdoor air to dehumidify vehicle indoors while passing through theinternal condenser and the PTC heater.
 15. The method of claim 14,wherein in the dehumidification mode, adjusting, by the controller, anexpansion amount of the refrigerant through adjustment of opening of thefirst and second expansion valves.
 16. The method of claim 14, whereinin the dehumidification mode, when the vehicle travels, opening eachswitch film that is installed at a front surface of the radiator toinject traveling wind into the radiator.
 17. The method of claim 10,wherein in the heating mode, the air conditioning mode, and thedehumidification mode, controlling, by the controller, a wind amount ofthe cooling fan and a flux of the water pump according to a temperaturestate of a waste heat that has occurred in the electrical equipment anda temperature state of the coolant and the refrigerant.